An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedances: Z0 = j 0.15 pu, Z1 = Z2 = j0.25 pu. The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for a single line to ground fault is:-
1
3.75 pu
2
4.28 pu
3
6.0 pu
4
7.25 pu